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Replace the Oil?

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aadams1278

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A few years back (before I knew better) that a friend was helping me empty my tank of bad gas. We accidentally ended up draining the wrong hose and drained part of the oil tank! (yeah yeah, lesson learned). So anyway, he had some outboard motor oil in his shop and said it would be fine, so we refilled it with that.

I'm 85% sure that oil was outboard 2 cycle oil which i've read on this forum over the past few days is NOT good to have in our Sea Doo engines. This jet ski (1996 SPI) has been running perfectly fine for the past 3 or 4 years since we put that oil in there with no problems at all.

I found the "acceptable" Quicksilver PWC replacement oil at my local walmart today and i'm tossing around the idea of replacing the oil. BUT...I also read several threads on here that mixing of oils is a bad thing and can cause it to gel and clog the whole system (which i'd like to avoid!). My plan was to disconnect the oil filter and drain the oil tank, then refill it with the new oil. That would leave the "old" oil in the feed line and return line to the crankcase for lubing those gears down there. With this "mixing can cause a gel" condition in mind, is it a bad idea to do what i just described? would I have to get all the oil out of those crankcase lines too?

We only drained a portion of the oil that day, so not 100% of the oil in the tank is outboard oil (if that's what it was, if i recall correctly). I don't know how quickly the oil is consumed, but I have not added any since then, so it's possible that the outboard oil never actually got to the engine. The oil in the lines that is going to the engine manifold is blue if that helps anybody determine what it is. I do know for a fact that the bombardier oil was used prior to this snafu a few years back.

And now the ultimate question...since it doesn't appear "broke" to me over the last several seasons, should I mess with it at all?!? People seem to speak pretty strongly about the outboard engine oil but "If it ain't broke, don't fix it" comes to mind.
 
I would drain it all out, and disconnect the hose going to the engine... and drain out what is in the rotary valve gears. Once you let it drip for a little while... you can refill it with the right oil. You don't have to clean out every drop... but get it drained as best as you can.
 
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